I am currently looking to buy two 5-channel amps to bi-amp two sets of Paradigm Studio 40s (front and sides). I want to spend anywhere from $1000-1200 total on both amps. Some options I have seen are: 1) H/K Signature 2.1 from jandr.com (100X5w, $499) 2) Carver AV705x sold on ebay (125X5w, ~550) My preamp for these is a Denon 3802. What else should I be considering for amps? Also, should I passively bi-amp or actively bi-amp? For the latter, how much more would it cost to purchase the external crossover (assume I'd buy something lower end given how much I am spending on the rest of my gear)? Is this relatively easy to do? Thanks for any help you can offer.